Browsing by Author "Rehana Mohi-ud-din"
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ThesisItem Open Access Evaluation of CERES-Maize model 4.6 for simulating the response of different maize cultivars to graded levels of nitrogen in temperate Kashmir(SKUAST Kashmir, 2019) Rehana Mohi-ud-din; Singh, Dr. LalThe present study, ‘‘Evaluation of CERES-Maize model 4.6 for simulating the response of different maize cultivars to graded levels of nitrogen in temperate Kashmir’’ was carried out at Agronomy farm, FOA wadura campus of Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir during 2016 and 2017. Experiment was laid in Factorial RBD assigning four maize cultivars- Composite-3 (C-3), Composite-4 (C-4) Composite-5 (C-5) and Composite-6 (C-6) and five nitrogen levels- N0: 0 kg N ha-1, N60: 60 kg N ha-1, N90: 90 kg N ha-1, N120: 120 kg N ha-1 and N150: 150 kg N ha-1 and was replicated three times. The results revealed that Composite-4 (C-4) produced highest grain yield of 45.56 and 40.78 q ha-1, stover yield 73.98 and 70.47 q ha-1 and biological yield of 119.54 and 111.25 q ha-1 during 2016 and 2017, respectively. Growth characters like plant height (cm), LAI, dry matter production, functional leaves and yield attributes like number of cobs per plant, cob length with and without husk (cm), cob weight with and without husk (g), cob girth with and without husk (cm), grains per cob, harvest index and nitrogen uptake were recorded highest with composite-4 (C-4) maize cultivar. To complete growth phases more days were taken by composite-4 (C-4) which was at par with composite-3 (C-3) and lowest days were taken by composite-5 (C-5). Among nitrogen levels, 150 kg N ha-1 recorded highest grain yield of 45.17 and 41.91 q ha-1, stover yield 76.60 and 73.46 q ha-1 and biological yield 121.77 and 115.37 q ha-1 during 2016 and 2017, respectively. More number of days to complete different phenological stages was taken by higher N application treatment. Growth characters like plant height (cm), LAI, dry matter accumulation, functional leaves and yield attributes like number of cobs per plant, cob length with and without husk (cm), cob weight with and without husk (g), cob girth with and without husk (cm), grains per cob, harvest index and nitrogen uptake were recorded highest with application of 150 kg N ha-1 (N150) however, remained statistically at par with 120 kg N ha-1 (N120). Genetic coefficients of maize cultivars i.e. composite-3 (C-3), composite-4 (C-4), composite-5 (C-5) and composite-6 (C-6) were generated for calibration and validation of model CERES-Maize V 4.6 (DSSAT). Days to anthesis, maturity, LAI, grain yield, biological yield, nitrogen in grain and stover and total nitrogen uptake were used for validation. The DSSAT- CERES–Maize model performed well [as revealed by correlation coefficient (r), low root mean square error (RMSE) and low mean absolute percentage error (MAPE)] in simulating the days to anthesis (r = 0.30; RMSE = 2.41; MAPE = 2.92 %), maturity (r = 0.82; RMSE = 4.10; MAPE = 2.75 %), leaf area index (r =0.83; RMSE = 0.58; MAPE = 10.06 %), grain yield (r = 0.96; RMSE = 262.92; MAPE = 6.27 %), biological yield (r = 0.83; RMSE = 996.63; MAPE = 8.17 %), nitrogen in grain (r = 0.92; RMSE =5.05; MAPE = 7.74 %), nitrogen in stover (r = 0.77; RMSE =5.23; MAPE = 7.56 %) and total nitrogen uptake (r = 0.91; RMSE = 7.93; MAPE = 6.09 %). Simulation studies indicated that composite-4 (C-4) can be grown with higher yield. Highest response of fertilization (150 kg N ha-1) to all four maize cultivars has achieved, though highest yield was obtained from composite-4 (C-4) with 150 kg N ha-1 nitrogen application. Composite-5 (C-5) and without application of nitrogen recorded lowest simulated yield as observed at FOA, Wadura. The study finally concluded that the grain yield showed decreasing trend in composite-5 (C-5), while irrespective of maize cultivar, application of 120 kg N ha-1 to crop resulted in higher growth, yield attributes and yield of maize as compared to other nitrogen levels, further increase in N application beyond 120 to 150 kg N ha-1 showed non-significant increase as observed from field data at FoA, Wadura. However, model simulated yield was increased significantly upto 135 kg N ha-1 while beyond 135 kg N ha-1 showed non-significant effect on yield. It is concluded that DSSAT v 4.6 CERES-Maize model is very robust in predicting the growth and yield of maize as influenced by agrotechniques and could be used in wider perspective.ThesisItem Open Access Growth, yield and quality of sweet corn (Zea mays saccharata L.) as influenced by sowing dates and spacing(SKUAST Kashmir, 2015) Rehana Mohi-ud-din; Dar, Nasir AhmadThe field experiment entitled “Growth, yield and quality of sweet corn (Zea mays saccharata L.) as influenced by sowing dates and spacing” was carried at SKUAST-K, Shalimar during kharif season 2014. Sweet corn cv. Misthi was chosen for the study. The experiment comprised of two factors with four sowing dates viz. 24th May (D1), 2nd June (D2), 11th June (D3) and 19th June (D4) as main-plot treatments and three plant spacing viz. 60 × 20 cm (S1), 70 × 20 cm (S2) and 80 × 20 cm (S3) as sub-plot treatments replicated thrice. Results of the experiment revealed that 24th May (D1) sowing recorded significantly highest plant height, number of functional leaves, leaf area index and dry matter accumulation as compared to other sowing dates. Among, plant spacing 80 × 20 cm recorded highest plant height followed by 70 × 20 cm, whereas 60 × 20 cm recorded significantly lowest plant height and leaf area index and dry matter accumulation which was significantly superior at 60 × 20 cm than 70 × 20 cm and 80 × 20 cm. Sowing sweet corn on 24th May (D1) recorded more number of days taken to tasseling, silking and harvesting followed by 2nd June (D2) sowing whereas, the lowest number of days taken to tasseling, silking and milking was recorded on 19th June (D4). Plant spacing of 80 × 20 cm (S3) measured highest number of days taken to tasseling, silking and harvesting whereas, spacing of 60 × 20 cm (S1) recorded lowest number of days taken to tasseling, silking and haresting. Yield attributes like number of cobs plant-1, cob girth, cob length and cob weight with and without husk were found highest in 24th May (D1) sowing which resulted in significantly highest sweet corn yield with husk (133.10 q ha-1) and without husk (108.83 q ha-1) and green fodder yield (256.11 q ha-1) whereas lowest corn yield with husk (66.17 q ha-1) and without husk (51.60 q ha-1) and green fodder yield (241.22 q ha-1) were recorded in 19th June (D4) sowing of sweet corn. Plant spacing of 60 × 20 cm (S1) recorded significantly highest sweet corn yield with husk (126.53 q ha-1) and without husk (100.55 q ha-1) and green fodder yield (243.41q ha-1) as compared to 70 × 20 cm (S2) and 80 × 20 cm (S3). Quality parameters viz. protein content, TSS (cob and fodder), vitamin C and vitamin A were not affected by different sowing dates and plant spacing. The economic analysis showed that highest net profit and benefit cost ratio of 371520.82 and 4.76 was recorded by sowing sweet corn with 24th May (D1) with a plant spacing of 60 cm × 20 cm (S1) whereas lowest net profit and benefit cost ratio of 89308.21 and 1.14 was recorded by sowing sweet corn with 19th June (D4) with a plant spacing of 80 cm × 20 cm (S3).